Electric-arc lamp



(No Model.)

L. DAFT.

y ELBGTRIQ ARG LAMP. No. 276,566. Patented May 1,1883.

N. pmsnsyhowuxhngmprw. waan-mom n, C.

the carbonholder.

UNITED STATES PATENT OFFICE..

LEO DAFT, OF GREENVILLE, NEW` JERSEY.

ELECTRIC-ARC LAMP.

,SPECIFICATION forming part of Letters Patent No, 276,566, dated May I, 1888,

(No model.)

To all whom it may concern:

Be it known that I, LEO DAFT, a citizen of Great Britain, now residing at Greenville, in the State of New Jersey, haveinvented a new and useful Improvement in Electric Lamps or Regulators, ot which thefollowing isafull,true, and exact description, reference being had to the accompanying drawings.

My invention relates to au improvement iu electric lamps or regulators, by means of which the'hollow coil and axial magnet are dispensed with, and an ordinary U-magnet ot' a peculiar shape having a fixed core substituted therefor.

In my improved lamp the vertical movement of the carbon is accomplished by means of an armature which is laterally attracted toward a fixed magnet, said armature being itself preterably polarized and made of opposite polarity to that of the attracting-pole of the magnet.

Myinvention will be readily understood from the accompanying drawings, in which Figure l represents an elevatiomand Fig. 2a plan view.

Similar letters refer to similar parts.

The whole details ot' the lamp are not given, but merely the working parts of my improvement.

A represents the frame of the lamp,`suitably supported and arranged; B, the carbon-holder; C D,coils of a U-magnet,the poles being turned toward each other, as shown. The rear ends are connected by the yoke F, which makes a magnetic connection between the cores of the coils O D, thereby increasing the attractive force. The coils O D, as usual, are so wound as to produce opposite polarities in their cores. Attached to the core ofthe spool C is the vibrating armature G, which is arranged to lift This armature is pivoted to the core of the coil C and magnetically connected therewith. It surrounds the carbonholder B, where it is enlarged into a ring, as shown at H. The inner end of the core ot' the coil D is preferably curved, so as to correspond with the arc swept by the free end ot' G as it is elevated, and the said free end oi' G may he correspondingly curved, as shown in Fig. 1. The coil D and its core are made vertically adjustable in the support by means of the screw L,'therehy determining the length of the arc ofthe lamp. The coil D is surrounded by the auxiliary or diierential coil E, which may be used, when required, in the well-known way. The clutch of the carbon-holder is ofthe form heretofore described by me in au application tiled on the 11th day ot'August,lS82. The links I( K are attached to the ends of levers which control cams bearing against the carbon-holder B, which cams are supported in a frame,M. As the armature G is elevated the cams are turned in against the carbon holder, which therefore rises with the armature, while when the armature G drops, the lever ends are dropped, the eccentrics or cams thrown away from the carbon-holder, and the carbon-holder falls. The links K K are pivoted opposite each other on aline passing through the center of.' the carbon-holder B, at right angles to the movement of the armature, thereby giving au equal movement to both cams.

The operation of this lamp will be readily understood. As soon as the electric current flows through the coilsCD, which are ot' course connected in circuit, as usual, the end ot' the armature G and the inner end of the core of the coil D will possess opposite polarities, and said free end will consequently be immediately raised. As it is elevated the clutch ou the carbon-holder is operated and the carbonholder is raised, establishing the arc. The length of this arc is determined by the adjustingscrewLiu themannerpreviouslydescribed. The arc, if extinguished, is re-established by the droppngof the carbon-holder B in the manner previously described.

I do not limit myself to the precise arrangement shown, as other modifications will readily su gest themselves.

hat I claim as my invention, and desire to secure by Letters Patent, ism

l. An electric-lamp regulator which consists of a carbon-holder, a polarized armature piv oted at one end at one side ofthe carbon-holder and crossing the latter, a magnet adjacent to the free end of the armature for raising the same,and magnetically connected with the pivot of the armature for polarizing the same, and a clutch connecting the armature and the carbon-holder, substantially as described.

2. The combination, in an electric-lamp regulator, of a carbon-holder and polarized armature pivoted so as to swing in a vertical plane, acoil on the opposite side ofthe carbon-holder,

IOO

and facing and adapted to raise the free cud of the armature, and a clutch for raising,` the carbon-holder, substantially as described.

3. The combination, in an electric-lamp regulator, of a vertically-moving polarized armature surrounding a carbon-bolder, said armature being` piyoled so as to swing' in a vertical plane,anda magnet-coil past tliepole of which said armature swings, said coil surrounding a core which is magnetically connected with tbe pivoted armature for the purpose of magnetizing the saine, substantially as described.

4. The combination, in an electric-lamp regulator, of the free extension-armature G, coils C, to which said armature is pivoted, polarizing the saine,tl1e stationary coil D, adapted to attract the free end of said armature G, the clutch, andthe carboirlxolder, substantially as described.

The combination of the carbon-holder B, the vertically-swinging pivoted armature G, the coil (l, and thc attracting-magnet D, itself made vertically adjustable, Substantially as described.

LE() DAFT.

Witnesses:

G-Eo. H. EVANS, WM. A. PoLLoo/K. 

